Acrylamide stimulates glutamine uptake in Fischer 344 rat astrocytes by a mechanism involving upregulation of the amino acid transport system N.

Abstract:

:High demand of neoplastic tissues for glutamine (Gln) is met by its active transport across cell membranes. Chronic treatment with acrylamide in rodents is associated with an increased incidence of neoplasms, including astrocytomas. In this study, 24-h acrylamide treatment significantly increased the initial rate of l-[G-3H]glutamine uptake in astrocyte cultures derived from the acrylamide-sensitive Fischer 344 rat, and this effect could be fully inhibited by histidine, a model substrate for the amino acid transport system N. RT-PCR analysis revealed that acrylamide treatment caused a significant increase in the astrocytic expression of the mRNA coding for the major system N protein, SNAT3, which is specifically overexpressed in malignant gliomas in situ. The acrylamide-induced upregulation of astrocytic Gln transport via system N is likely to affect Gln homeostasis in these cells and may be causally related to the increased astrocytoma incidence observed in Fischer 344 rats.

journal_name

Ann N Y Acad Sci

authors

Wu Q,Sidoryk M,Mutkus L,Zielińska M,Albrecht J,Aschner M

doi

10.1111/j.1749-6632.2005.tb00052.x

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

435-43

eissn

0077-8923

issn

1749-6632

pii

1053/1/435

journal_volume

1053

pub_type

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